Agreed, both worlds are highly sensitive and EXTREMELY highly kinky; rarely will you find so many people really getting off at this fantasy knowing they will NEVER dulge into it in real life.
My personal opinion about a submissive female being taken by a male dog while her Master watches and aides in the process can be expressed in one single word:
Yummy!
But then again: it's firmly attached in the world of my fantasy, and I don't think it might ever get to this side of the blurry line between the two worlds...